You have not mentioned your qualification. Anyway knowing about six-sigma is not wrong.
Motorola was the first company to originate this. Six sigma can be called Quality Control, a means to rectify the deviation of the product or service from the original plan. Many companies have successfully implemented this and thereby improved both their quality and service. Customers satisfaction is the utmost important aspect.
Six Sigma training centers exist in the major cities of India. Those who have completed this get a chance to become a Management Executive.